陕西渭北聚煤区原煤的微量元素组成特征

THE CONTENT OF TRACE ELEMENTS OF COALS IN WEIBEI AREA,SHAANXI PROVINCE

对陕西省渭北主要煤田主采煤层中的As、Pb、Hg、Cd、Se、Cu、Sr、Ba、B等微量元素的分析结果表明 :渭北原煤中Hg、Se、As、Pb、B含量明显高于地壳平均值 ,呈富集状态 ;Co、Cd与地壳平均值接近 ,Cu、Zn、Sr、Ba等元素均亏损。太原组和山西组由于成煤环境不同 ,煤质和原煤的微量元素组成特征存在一定的差异。太原组煤的灰分和硫分均较山西组煤高 ,原煤中As、Hg、Se、Pb、Zn、B的含量明显高于山西组原煤 ,而山西组原煤中V、Cr、Cu、Mn、Ba的含量则明显高于太原组原煤。统计分析表明 ,As、Hg、Se、Pb、Cu等亲硫元素与铁呈显著的正相关关系 。

Concentration of As, Pb, Hg, Cd, Se, Cu, Sr, Ba, B and other tr ac e elements have been determinated in channel samples collected at main active mi nes in Weibei, Shaanxi province. Analysis results show that concentration of Hg, Se, As, Pb, and B of Weibei coals are markedly higher than average values of th e earth crust, Co and Cd concentration of coals are approach the earth crust ave rage value, and Cu, Zn, Sr, Ba, and other trace elements in Weibei coals are spa rsity. Characteristics and trace elements of coal in Taiyuan group and Shanxi gr oup are different for the difference of coal-forming environment. Ash and sulfur of coal in Taiyuan group is higher than which in Shanxi group, and the content of As, Hg, Se, Pb, Zn and B are obvious larger in Taiyuan group than in Shanxi g roup, but the concentration of V, Cr, Cu, Mn, and Ba are lower in Taiyuan group. Statistical results show As, Hg, Se, Pb, and Cu correlate with Fe, which indica te As, Hg, Se, Pb and Cu may possibly be existed in pyrite in coals.